The “Clerks” writer and director was shooting a new standup special titled “Kevin Smith Live!” at the Alex Theatre in Los Angeles on Sunday evening. Smith, who was scheduled to perform two shows that night (one at 6 p.m. and another at 9 p.m.) took to Twitter to announce that the second show had been cancelled.

“After the first show this evening, I had a massive heart attack,” the Silent Bob actor wrote alongside a selfie taken in his hospital bed. “The Doctor who saved my life told me I had 100% blockage of my LAD artery (aka ‘the Widow-Maker’). If I hadn’t canceled show 2 to go to the hospital, I would’ve died tonight. But for now, I’m still above ground!”

After the first show this evening, I had a massive heart attack. The Doctor who saved my life told me I had 100% blockage of my LAD artery (aka “the Widow-Maker”). If I hadn’t canceled show 2 to go to the hospital, I would’ve died tonight. But for now, I’m still above ground! pic.twitter.com/M5gSnW9E5h